What happened to the %original_performer% tag?

Aha i found it. it’s a plugin that i guess isn’t compatible with 2.x. i wonder how i could go and update it.
I can’t even find any info on it online which i strange.

PLUGIN_NAME = 'Song is cover of...'
PLUGIN_AUTHOR = 'Rodolfo Gonella Diaza'
PLUGIN_DESCRIPTION = 'Obtain information about the original performer of a song. In case of cover creates "original_performer" tag. In case of medley creates "medleyof" tag.'
PLUGIN_VERSION = '0.2'
PLUGIN_API_VERSIONS = ["1.3"]
 
from picard.metadata import register_track_metadata_processor
from picard.log import debug
from picard.log import warning
import re
 
def get_element_by_targettype(source, t_type):
	for e in source:
 	    if e.target_type == t_type:
			return e
	return -1


def get_original_artist(source, track_artist):
	orig_artist = []
	orig_artist_all = []
	
	for p in source.work[0].relation_list:
		if p.target_type == "recording":
			debug("\ttrack has %d recordings" % (len(p.relation),) )
			for r in p.relation:
				if hasattr(r, "attribute_list"):
					continue
										
				try:
					if hasattr(r.recording[0].artist_credit[0].name_credit[0], "joinphrase"):
						continue
					if r.recording[0].artist_credit[0].name_credit[0].artist[0].name[0].text in track_artist:
						debug(r.recording[0].artist_credit[0].name_credit[0].artist[0].name[0].text + " in " + " - ".join(track_artist))
						continue
					
					
					debug (r.recording[0].id)
							
					if r.recording[0].artist_credit[0].name_credit[0].artist[0].name[0].text not in orig_artist:
						orig_artist.append(r.recording[0].artist_credit[0].name_credit[0].artist[0].name[0].text)
					
					orig_artist_all.append(r.recording[0].artist_credit[0].name_credit[0].artist[0].name[0].text)
					
				except Exception as ex:
					debug("Something wrong among the nested elements")
					template = "An exception of type {0} occured. Arguments:\n{1!r}"
					message = template.format(type(ex).__name__, ex.args)
					debug(message)
					return -1
					
			break
	
	if len(orig_artist) == 1:
		return orig_artist[0]
	else:
		debug("\t" + str(len(orig_artist)) + " original recordings found by " + ", ".join(orig_artist))
		mostcommon = max(set(orig_artist_all), key=orig_artist_all.count)
		debug("Most common: " + str(mostcommon))
		return mostcommon

	return -1
	
def get_medley_songs(source, track_artist):
	songs = []
	for s in source:
		medley = False
		for c in s.attribute_list[0].attribute:
			if c.text == "medley":
				medley = True
				break
		
		try:
			if medley:
				songs.append(s.work[0].title[0].text)
		except Exception as ex:
			debug("Something wrong among the nested elements")
			template = "An exception of type {0} occured. Arguments:\n{1!r}"
			message = template.format(type(ex).__name__, ex.args)
			debug(message)
			continue
			
	return songs

def add_trackisacover(album_id, metadata, track, release):
	c_original_artist = ""
	c_cover_type = ""
	c_songs_in_the_medley = ""
	
	debug(metadata['title'])

	if not metadata['~performance_attributes']:
		debug("\tNo '~performance_attributes' found in metadata")
		return
   
	if "cover" in metadata['~performance_attributes']:
		c_cover_type = "cover"
	if "medley" in metadata['~performance_attributes']:
		c_cover_type = "medley"
   
	if c_cover_type == "":
		debug("\tNo cover type for in '~performance_attributes'")
		return
   
	if not hasattr(track, 'recording'):
		debug("\tNo 'recording' attribute found in 'track'")
		return	

	for r in track.recording[0].relation_list:
		if r.target_type == "work":
			work = r
	
	if work == -1:
		debug ("\tNo 'work' among the track relationships")
		return
		
	relations=work.relation	
	
	if c_cover_type == "cover":
		c_original_artist = get_original_artist(relations[0], metadata['artist'])
		if c_original_artist <> -1:
			metadata['original_performer']=c_original_artist
		
	elif c_cover_type == "medley":
		all_medley_artist = []
		for s in relations:
			cur_orig_art = get_original_artist(s, metadata['artist'])
			if cur_orig_art == -1:
				continue
				
			if cur_orig_art not in all_medley_artist:
				all_medley_artist.append(cur_orig_art)
			
		if len(all_medley_artist) == 1:
			metadata['original_performer'] = all_medley_artist[0]
		else:
			debug("\tMedley artists: " + " - ".join(all_medley_artist))

		 
		OriginalSongs = get_medley_songs(relations, metadata['artist'])
		if len(OriginalSongs) > 0:
			#c_songs_in_the_medley = "(" + " - ".join(OriginalSongs) + ")"
			metadata['medleyof']=OriginalSongs
	return


register_track_metadata_processor(add_trackisacover)